    function safe_add(x, y)  
    {  
      var lsw = (x & 0xFFFF) + (y & 0xFFFF)  
      var msw = (x >> 16) + (y >> 16) + (lsw >> 16)  
      return (msw << 16) | (lsw & 0xFFFF)  
    }  
      
    /* 
     * Bitwise rotate a 32-bit number to the left. 
     */  
    function rol(num, cnt)  
    {  
      return (num << cnt) | (num >>> (32 - cnt))  
    }  
      
    /* 
     * These functions implement the four basic operations the algorithm uses. 
     */  
    function cmn(q, a, b, x, s, t)  
    {  
      return safe_add(rol(safe_add(safe_add(a, q), safe_add(x, t)), s), b)  
    }  
    function ff(a, b, c, d, x, s, t)  
    {  
      return cmn((b & c) | ((~b) & d), a, b, x, s, t)  
    }  
    function gg(a, b, c, d, x, s, t)  
    {  
      return cmn((b & d) | (c & (~d)), a, b, x, s, t)  
    }  
    function hh(a, b, c, d, x, s, t)  
    {  
      return cmn(b ^ c ^ d, a, b, x, s, t)  
    }  
    function ii(a, b, c, d, x, s, t)  
    {  
      return cmn(c ^ (b | (~d)), a, b, x, s, t)  
    }  
      
    /* 
     * Calculate the MD5 of an array of little-endian words, producing an array 
     * of little-endian words. 
     */  
    function coreMD5(x)  
    {  
      var a =  1732584193  
      var b = -271733879  
      var c = -1732584194  
      var d =  271733878  
      
      for(var i = 0; i < x.length; i += 16)  
      {  
        var olda = a  
        var oldb = b  
        var oldc = c  
        var oldd = d  
      
        a = ff(a, b, c, d, x[i+ 0], 7 , -680876936)  
        d = ff(d, a, b, c, x[i+ 1], 12, -389564586)  
        c = ff(c, d, a, b, x[i+ 2], 17,  606105819)  
        b = ff(b, c, d, a, x[i+ 3], 22, -1044525330)  
        a = ff(a, b, c, d, x[i+ 4], 7 , -176418897)  
        d = ff(d, a, b, c, x[i+ 5], 12,  1200080426)  
        c = ff(c, d, a, b, x[i+ 6], 17, -1473231341)  
        b = ff(b, c, d, a, x[i+ 7], 22, -45705983)  
        a = ff(a, b, c, d, x[i+ 8], 7 ,  1770035416)  
        d = ff(d, a, b, c, x[i+ 9], 12, -1958414417)  
        c = ff(c, d, a, b, x[i+10], 17, -42063)  
        b = ff(b, c, d, a, x[i+11], 22, -1990404162)  
        a = ff(a, b, c, d, x[i+12], 7 ,  1804603682)  
        d = ff(d, a, b, c, x[i+13], 12, -40341101)  
        c = ff(c, d, a, b, x[i+14], 17, -1502002290)  
        b = ff(b, c, d, a, x[i+15], 22,  1236535329)  
      
        a = gg(a, b, c, d, x[i+ 1], 5 , -165796510)  
        d = gg(d, a, b, c, x[i+ 6], 9 , -1069501632)  
        c = gg(c, d, a, b, x[i+11], 14,  643717713)  
        b = gg(b, c, d, a, x[i+ 0], 20, -373897302)  
        a = gg(a, b, c, d, x[i+ 5], 5 , -701558691)  
        d = gg(d, a, b, c, x[i+10], 9 ,  38016083)  
        c = gg(c, d, a, b, x[i+15], 14, -660478335)  
        b = gg(b, c, d, a, x[i+ 4], 20, -405537848)  
        a = gg(a, b, c, d, x[i+ 9], 5 ,  568446438)  
        d = gg(d, a, b, c, x[i+14], 9 , -1019803690)  
        c = gg(c, d, a, b, x[i+ 3], 14, -187363961)  
        b = gg(b, c, d, a, x[i+ 8], 20,  1163531501)  
        a = gg(a, b, c, d, x[i+13], 5 , -1444681467)  
        d = gg(d, a, b, c, x[i+ 2], 9 , -51403784)  
        c = gg(c, d, a, b, x[i+ 7], 14,  1735328473)  
        b = gg(b, c, d, a, x[i+12], 20, -1926607734)  
      
        a = hh(a, b, c, d, x[i+ 5], 4 , -378558)  
        d = hh(d, a, b, c, x[i+ 8], 11, -2022574463)  
        c = hh(c, d, a, b, x[i+11], 16,  1839030562)  
        b = hh(b, c, d, a, x[i+14], 23, -35309556)  
        a = hh(a, b, c, d, x[i+ 1], 4 , -1530992060)  
        d = hh(d, a, b, c, x[i+ 4], 11,  1272893353)  
        c = hh(c, d, a, b, x[i+ 7], 16, -155497632)  
        b = hh(b, c, d, a, x[i+10], 23, -1094730640)  
        a = hh(a, b, c, d, x[i+13], 4 ,  681279174)  
        d = hh(d, a, b, c, x[i+ 0], 11, -358537222)  
        c = hh(c, d, a, b, x[i+ 3], 16, -722521979)  
        b = hh(b, c, d, a, x[i+ 6], 23,  76029189)  
        a = hh(a, b, c, d, x[i+ 9], 4 , -640364487)  
        d = hh(d, a, b, c, x[i+12], 11, -421815835)  
        c = hh(c, d, a, b, x[i+15], 16,  530742520)  
        b = hh(b, c, d, a, x[i+ 2], 23, -995338651)  
      
        a = ii(a, b, c, d, x[i+ 0], 6 , -198630844)  
        d = ii(d, a, b, c, x[i+ 7], 10,  1126891415)  
        c = ii(c, d, a, b, x[i+14], 15, -1416354905)  
        b = ii(b, c, d, a, x[i+ 5], 21, -57434055)  
        a = ii(a, b, c, d, x[i+12], 6 ,  1700485571)  
        d = ii(d, a, b, c, x[i+ 3], 10, -1894986606)  
        c = ii(c, d, a, b, x[i+10], 15, -1051523)  
        b = ii(b, c, d, a, x[i+ 1], 21, -2054922799)  
        a = ii(a, b, c, d, x[i+ 8], 6 ,  1873313359)  
        d = ii(d, a, b, c, x[i+15], 10, -30611744)  
        c = ii(c, d, a, b, x[i+ 6], 15, -1560198380)  
        b = ii(b, c, d, a, x[i+13], 21,  1309151649)  
        a = ii(a, b, c, d, x[i+ 4], 6 , -145523070)  
        d = ii(d, a, b, c, x[i+11], 10, -1120210379)  
        c = ii(c, d, a, b, x[i+ 2], 15,  718787259)  
        b = ii(b, c, d, a, x[i+ 9], 21, -343485551)  
      
        a = safe_add(a, olda)  
        b = safe_add(b, oldb)  
        c = safe_add(c, oldc)  
        d = safe_add(d, oldd)  
      }  
      return [a, b, c, d]  
    }  
      
    /* 
     * Convert an array of little-endian words to a hex string. 
     */  
    function binl2hex(binarray)  
    {  
      var hex_tab = "0123456789abcdef"  
      var str = ""  
      for(var i = 0; i < binarray.length * 4; i++)  
      {  
        str += hex_tab.charAt((binarray[i>>2] >> ((i%4)*8+4)) & 0xF) +  
               hex_tab.charAt((binarray[i>>2] >> ((i%4)*8)) & 0xF)  
      }  
      return str  
    }  
      
    /* 
     * Convert an array of little-endian words to a base64 encoded string. 
     */  
    function binl2b64(binarray)  
    {  
      var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"  
      var str = ""  
      for(var i = 0; i < binarray.length * 32; i += 6)  
      {  
        str += tab.charAt(((binarray[i>>5] << (i%32)) & 0x3F) |  
                          ((binarray[i>>5+1] >> (32-i%32)) & 0x3F))  
      }  
      return str  
    }  
      
    /* 
     * Convert an 8-bit character string to a sequence of 16-word blocks, stored 
     * as an array, and append appropriate padding for MD4/5 calculation. 
     * If any of the characters are >255, the high byte is silently ignored. 
     */  
    function str2binl(str)  
    {  
      var nblk = ((str.length + 8) >> 6) + 1 // number of 16-word blocks  
      var blks = new Array(nblk * 16)  
      for(var i = 0; i < nblk * 16; i++) blks[i] = 0  
      for(var i = 0; i < str.length; i++)  
        blks[i>>2] |= (str.charCodeAt(i) & 0xFF) << ((i%4) * 8)  
      blks[i>>2] |= 0x80 << ((i%4) * 8)  
      blks[nblk*16-2] = str.length * 8  
      return blks  
    }  
      
    /* 
     * Convert a wide-character string to a sequence of 16-word blocks, stored as 
     * an array, and append appropriate padding for MD4/5 calculation. 
     */  
    function strw2binl(str)  
    {  
      var nblk = ((str.length + 4) >> 5) + 1 // number of 16-word blocks  
      var blks = new Array(nblk * 16)  
      for(var i = 0; i < nblk * 16; i++) blks[i] = 0  
      for(var i = 0; i < str.length; i++)  
        blks[i>>1] |= str.charCodeAt(i) << ((i%2) * 16)  
      blks[i>>1] |= 0x80 << ((i%2) * 16)  
      blks[nblk*16-2] = str.length * 16  
      return blks  
    }  
      
    /* 
     * External interface 
     */  
    function hexMD5 (str) { return binl2hex(coreMD5( str2binl(str))) }  
    function hexMD5w(str) { return binl2hex(coreMD5(strw2binl(str))) }  
    function b64MD5 (str) { return binl2b64(coreMD5( str2binl(str))) }  
    function b64MD5w(str) { return binl2b64(coreMD5(strw2binl(str))) }  
    /* Backward compatibility */  
    function calcMD5(str) { return binl2hex(coreMD5( str2binl(str))) }  
    export default {  
												Md5: hexMD5,
												hexMD5:hexMD5,
												hexMD5w:hexMD5w,
												b64MD5:b64MD5,
												b64MD5w:b64MD5w
										} 